Window Installation & Replacement

Long Windows is the exclusive provider of Quantum2 Heat Mirror windows for the Washington, D.C. region, and is now available in Boston, Mass. and New England.

• The Quantum2 Heat Mirror window was developed with lightweight, suspended film technology. Our windows block 99.7 percent of UV light, reduce outside noise and insulates with the same strength as a wall.Quantum2 Heat Mirror windows are quieter than double-pane glass. They reduce window condensation and maximize natural light. That’s a level of performance above and beyond the typical triple-pane window.
  

• Quantum2 Heat Mirror windows are certified ENERGY STAR and U.S. Green Building Council products. The Quantum2 Heat Mirror window is also the window of choice in the Empire State Building. You’ll find them in the Sobek Glass House in Stuttgart, Germany, the Princess Elisabeth Antarctica research station and other world-famous structures. 
  

• Long Windows insists upon skilled workmanship, the highest-quality materials and dedication to customer satisfaction. We ensure your beautiful windows are easy to open and close and maintenance-free. Long Windows are a wonderful addition to the look of your home, inside and out.
  

• Long Windows installation packages come in a variety of colors and shades. We never use materials that will rust, rot or attract pests. Your window replacement project includes our Commercial Grade Constant Force Balance System. We eliminate the springs, strings, wires and balancers that can break, fail or fall apart.

Rest easier knowing that our residential replacement windows come with recessed steel locks. That’s adding a powerful degree of security to your home.

Quality Window Installation Services You Can Trust

Long Windows is the sole supplier of Quantum2 Heat Mirror windows in the Washington, D.C., metro region. We are proud to now offer our window products in Boston, Mass. and New England, as well. We take our dedication to quality seriously. We never settle for products that you’d have to settle for, too.

Heat Mirror windows were named one of Popular Science magazine’s top 100 inventions of the past 1,000 years in its Millennium Year Special Edition. 

Every new window installation project is given the same care, courtesy and respect that we would give our own family. When you work with Long Windows, you become part of our family, too.

Long Windows is part of the Long Fence and Home® family of brands. Our business has roots that stretch back to the original Long’s Fence Co. That company was launched in 1945 by Henry “Tots” Long and his son, Robert. The first location was a tiny parcel of land in the heart of Washington, D.C.

The Long family continues to lead the way in home improvement excellence. The original values of the company — quality craftsmanship, the best materials and outstanding customer service — remain the core of our business today.

The exclusive Washington, D.C. provider of Quantum2 Heat Mirror® windows.

The superior window product on the market today.

Windows that make your home smarter and safer.

Quantum2 Heat Mirror® windows make your home more energy-efficient, secure and look great, too.

An extensive track record of home improvement excellence.

The LONG name has stood for outstanding craftsmanship and quality customer service since 1945.

New Windows With a Warranty

When you need replacement windows, your budget is always on your mind. We can give you the peace of mind you need. Our Quantum2 Heat Mirror windows are maintenance-free, improve your home’s security and may even cut your energy bills.

Have a problem with your new windows or the window installation? We will make the situation right because we believe in 100% customer satisfaction. Contact us today.  

Window Replacement Financing

Need help paying for your beautiful new windows? We offer worry-free financing. We’re happy to work with you to find an affordable solution. Learn more now.